Water Supply

The drinking water source for Mountlake Terrace is surface water and snowmelt that flows to Spada Lake in the Sultan Basin. The City of Everett manages water treatment and distribution to various water purveyors in Snohomish County through a water use agreement. Everett supplies water to the Alderwood Water District. The Alderwood Water District then supplies water to the City of Mountlake Terrace.